Vigowebs offers “Indian Pincode” and “Global Zipcode” APIs with latitude and longitude information. This is a freemium API that is used to autofill the city and state from Pincode or zip code. …


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JavaScript is changing every year. There are always new libraries, new frameworks and new things around it. Every year new developers are coming to learn this language and the jobs are increasing so as the interviews.

This post contains some practical and commonly asked coding problems that can be found…


Q1. What is Vue.js? What are the advantages of it?

Vue is a progressive framework used to building user interfaces.The core library is focused on the view layer only, and is easy to pick up and integrate with other libraries or existing projects.

Following are the advantages of using Vue.js.


Q1. What is MongoDB and Why we need MongoDB?

MongoDB is the most famous NoSQL open source database management system. It is written in C++ language and developed by MongoDB Inc.

MongoDB is a document oriented database which means it stores the data in BSON format which is a binary…


Q1. What are the differences between null and undefined?

In JavaScript, undefined means, the value of the variable is not yet defined. And typeof undefined is also "undefined". We are getting undefined in JavaScript in some ways, like: declaring a variable without assigning any value to it, store a function…


Q1. How React works? How Virtual-DOM works in React?

React creates a virtual DOM. When state changes in a component it firstly runs a “diffing” algorithm, which identifies what has changed in the virtual DOM. The second step is reconciliation, where it updates the DOM with the results of diff.


Q1. What is ES or ECMAScript or ES6?

When JavaScript was developed, the name itself was chosen for marketing reasons since Java was getting popular around the time. But to standardize the language and its specification, it was submitted to ECMA international (European Computer Manufacturers Association), a body for standardization…


Q1. What is Angular 4 and how it differs from Angular 1.x?

Angular 4 is a Javascript framework built around the concept of components, and more precisely, with the Web Components standard in mind. …


Q1. What is TypeScript? Why should we use it?

TypeScript is a typed superset of JavaScript that compiles to plain JavaScript which runs on any browser or JavaScript engine.

TypeScript offers support for the latest JavaScript features and also has some additional features like static typing, object oriented programming and…


Q1. What is Node.js? What is it used for?

Node.js is a run-time JavaScript environment built on top of Chrome’s V8 engine. It uses an event-driven, non-blocking I/O model. It is lightweight and so efficient. Node.js has a package ecosystem called npm.

Node.js can be used to build different types…

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